Classic motorcycle

I prefer the old British bikes too. I still have a '76 Bonneville 750 that I keep saying I'm going to break out again. I ran a Brit bike shop for about 5 years until I got bored with it and sold it off. Of the 3 Brit bikes mentioned of course Triumph is the most popular followed by BSA but the most valuable is going to be the Norton. Parts are still readily available (depending on model) for all 3 of them both new and used with sheet metal being the most costly and hardest to find

good luck